import qs from "qs";
import * as auth from "auth-provider";
import { useAuth } from "context/auth-context";
import { useCallback } from "react";

const apiUrl = process.env.REACT_APP_API_URL;

interface Config extends RequestInit {
  token?: string;
  data?: object;
}

export const http = async (
  endpoint: string,
  { data, token, headers, ...customConfig }: Config = {}
) => {
  const config = {
    method: "GET",
    headers: {
      Authorization: token ? `Bearer ${token}` : "",
      "Content-Type": data ? "application/json" : "",
    },
    ...customConfig,
  };

  if (config.method.toUpperCase() === "GET") {
    endpoint += `?${qs.stringify(data)}`;
  } else {
    config.body = JSON.stringify(data || {});
  }

  // axios 和 fetch 的表现不一样，axios可以直接在返回状态不为2xx的时候抛出异常
  return window
    .fetch(`${apiUrl}/${endpoint}`, config)
    .then(async (response) => {
      if (response.status === 401) {
        await auth.logout();
        window.location.reload();
        return Promise.reject({ message: "请重新登录" });
      }
      const data = await response.json();
      if (response.ok) {
        return data;
      } else {
        return Promise.reject(data);
      }
    });
};

export const useHttp = () => {
  const { user } = useAuth();
  // Parameters:TS Utility Types，用泛型给它传入一个其他类型，然后utility type对这个类型进行某种操作
  // 联合类型
  // let myFavoriteNumber : string | number
  // 类型别名
  // type favoriteNumber = string | number
  // let myFavoriteNumber : favoriteNumber
  //   type Person = {
  //     name: string;
  //     age: number;
  //   };
  // const xiaoming: Partial<Person> = {}
  // const shenmiren: Omit<Person, 'name'> = { age: 8 }
  // const shenmiren: Omit<Person, 'name' | 'age'> = {}
  // type PersonKeys = keyof Person
  // type PersonOnlyName = Pick<Person, 'name'>
  // type Age = Exclude<PersonKeys, 'name'>
  return useCallback(
    (...[endpoint, config]: Parameters<typeof http>) =>
      http(endpoint, { ...config, token: user?.token }),
    [user?.token]
  );
};
